You can also ask a librarian for help. We like finding things and might be able to get a copy through interlibrary loan or other connections. We also like girl scout cookies, especially the ones with coconut.
If you are are doing any kind of learning (as a citizen or registered student) your local librarian, particularly your local academic librarian, is your best friend and you just don’t know it yet. Introduce yourself, and come with questions.
But don’t neglect your public librarians either - that light I saw in their eyes when asking about an obscure service they offered stuck with me.